Frequency-indicator.



No. 845,956. ,PATENTED MAR. 5, 1907.

v A. S. LANGSDORF.

FREQUENCY INDIOATOR. APPLI'UATION FILED SEPT. e, 1906'.

I WINE-88E. INVENTOR Z A. S. \Langsdorf.

UNITED STATES FATE T OFFICE. I

ALEXANDER S. LANGSDORF, OF ST; LOUIS, MISSOURI, ASSIGNoR TO WAG- NER ELECTRIC MANUFACTURING A CORPORATIQN or ISSO R OMPANY, OF ST. LOUIS, MISSOURI,

FREQUENCY-INDICATOR No. 845,956. j

Specification of Letters Patent.

Patented March 6, 1907.

Application filed September 6, 1906. Serial in. 333,413.

To all chant it may concern:

Be it known that I, ALEXANDER S. LANGS- DORF, a citizen of the United States,residing at the city of St. Louis, in the State .of- Missouri, have invented a certain new and'use ful Frequency-Indicator, of which the followingis such a full, clear, and exact descriptionas will enable any one skilled in the art to which it appertains to make and use the same, reference being had to'the accompanying drawings, forming part of-this specifica tion.

the current expressed in amperes will equal 271 times the product of the frequency,the electromotive force of the current in volts,

j and the capacity of the condenser in farads. If, therefore, an ammeter is contained in such a circuit, the indications of its pointer will be proportional to the frequency of the current, provided the electromotive force remains constant. In practice, however,-the electrometive :force of the current the frequency of which is to be indicated will vary, and consequently. the indications of an arnmeter situated as above described would vary with the electromotive force, and if such'an instru- ,ment were used to indicate frequency the variations, due to the change in electromotive force would give IlSGdJO apparent changes in frequency. To overcdme this difliculty, I

provide a movable Scale cooperating with the pointer of the instrument, the direction and amount of movement of'such scale due to trate one form of-meter made n accordance with my invention, Figure 1 is a diagrammatic view in perspective; and Fig 2 s a 'diagmmmatic plan w, e pointer and Scale being omitted. 1

7 Like marks of reference, refer to similarparts of both views of the' drawing'sr 5 and'6 representthe' line wires. Leading fromjtherline-w-ireo is a conductor 7,

from which lead twoconductors 8 and 9, respectivelyyso; that the current passing from the line-wire, 5' over the wire 7 divides and takestwo separate paths; The'portion of the current passingoverj the conductor 8 passes through a stationary field-coil- 10; From the field-coil 10 the current passes l through a conductor 11 to a movable coil12. This movable coil 12 carries a pointer 13. The current after passing through the coil 12 iplasses through aconductor 14 to, a second fixed eld-coil 15, symmetrically placed with relae tion to the movable coil 12 and thefield-cqil 10. Leading from the field-coil 15'is a conductor 16, containing a. condenser 17'. The

conductor 16 is connected to a conductor 18,

which returns to the second line-wire 6, thus completing the circuit through the field-coils 10 and 15, the movable coil 12, and .thecon-' denser 17. The remaining portion of the divide current passes through the conductor 9 ,to a fixed field-coil 20. From the coil 20'the current passes through a conductor 21 to a movable'coil 22. This coil 22 is pivoted in a line coaxial with the movable'ooil 12-and pointer 13 and carries'a scale 23, which'cooperates with the said pointer-1 3.- The current asses from the movable coil 22 throu h a condiictor 24 to a fixed field-coil 25. he

field-coils 20 and 25 are arranged in the same relation to the movable coil 22 that the fieldcoils 10 and-15,- hereinbefore described, bear to the movable coil 12; The current after passing through the -field-co1l 25 passes over a'conductor 26 to the conductor 18,

hereinbefore described, and thence returns to the line-wire 6. In practice I refento mount the field-coils and movable'c01 s on a base- 27,

as shown in Fig. 2, said base being provided with suitable binding-posts 2.8 for connection with the conductors and to mount-the con-- denser 17 on a separate base 29, as shown.

in saidfigure, said base being provided with binding-posts 30 for connection with the con-' 'ductors.

- 45 =f apair of indicating devices cooperating It will be seen that the .movement'of the coil 12, and consequently of the pointer .13, will vary with the frequency of the current to be measured and also with the variation in electromotiveforce of said current, while the coil 22 and the scale 23 carried thereby will not be affected by the change in frequency, but will be affected by the change in voltage, so that the direction and amount of 1o movement ofsaid parts due to the change in voltage will beidentical with the movement of the parts 12 and 13 due to such change, and consequently that relative movement between the/pointer 13 and scale 23 will be 15 due solely to the change in frequency, and

consequently such change may be read directly from the said scale 23.

' In place of the" condenser 17 shown in the.

drawings I*may'use an inductance .or any '20 other device whichwill cause the current "with a pair .0

I through the movable coil 12 to vary with the fre uency of the current in the main lines o as with the voltage in said aniIfi, as well main lines. v

Having fully described my invention, what I'claim as new, and desire to'secure by Let ters Patent of the UnitedStates, is

, 1. Ina frequency-meter, the combination \with a pair of cooperative indicating devices,-

of means for movin one of said indicating devices pro ortiona to the voltage and freqnency of t e current to be measured, and inoving the other of said indicating devices proportional to the voltage of the current to be 5 =1neasured.. I

i 2. Ina frequency-meter, the combination with a pair of independently-movable coils,

of-a pair of indicating devices cooperating to indicatethe fre 'uency,'one of said devices 0 being controlled y each coil, and means in series-with one of said coils for varying the current with the frequency. 7 i

3, In a he uency-meter, thecombination with afpair'gf independently-movable coils,

indicate the fre uency, one of said devices being controlled y each coil, and'a condenser in series with one of said coils. 4; In a fre uency-meter, the combination 5oi with a pair 0 independentlymovable coils arranged.in multiple circuit, of a pair of indicating devices cooperating-to indicate the fr uency,- one of said devices being contro ed by each coil, means in series with one of said coils for varying the current with the frequency. i

5. In a fre uency-m'eter, the combination with a pairo independently-movable coils arranged in multiple circuit, of a pair of indieating devices cooperating to indicate the fre uency, one of said devices being contro ed by each coil, and a condenser in series with one of said coils.

. .6.v In a fre' uency-meter, the combination with a pair 0 independently-movable coils,

of sa'idcoils.

, said coils-an cooperating wit of a pair of indicating devices coo crating to indicate the frequenc one of sai indicating devices being carried y each coil, and means in series with one of said coils for varying the current with the frequency. v

7. In'a fre uency-meter, the combination with a, pair o independently-movable coils, ofa pan of lndicating'devices coo erating to mdicate the frequency, one of sai indicating devices beingcarried by each coil, and a con:

denser. in series with one o'fsa'id coils.

8. In a frequency-meter, the combination with a pair of independently-movable coils arranged in multiple'circuit, of a pair of indicating .devices cooperating to indicate the frequency, one of said indicating devices being carried by each coil, and means in series with o e of said coils for varying the current with the frequency.

'9. In a fre uency meter, the combination independently-movable coils arranged in multiple circuit, of apair of indicating devices cooperating to indicate the frequency, one of said indicatingdevices being carried by each coil, and a condenser in series with one of said coils. V 10.-' In a frequency-meter, the combination with a pair of independently-movable coils, of "a scale carried by one of said coils, a

pointer carried bytheother of said coils and cooperatingwith said scale to indicate the fre uency,-and means in series with one of sai coils for. varying the'current. with the frequency 1 1 In a frequency-meter, the combination wlth a pair of-independently-movable coils, of a scalecarried by one of said coils, a

pointer carried by the other of-said coils and cooperating with said scale to indicate thefrequency, .and a condenser in series :Vlth one '12. In alirequency-meter, the combination with a air of independently-movable coils in multip e circuit, of a scale carried by one of said coils, a ointer carried by the other of said coils an cooperating wisaid scale to IIO indicate the frequenc and means in series I the other of crating to indicate the frequency, one of said indicating devices beingcontrolled by each movable coil and means in series with one of with the frequency.

' said movable coils for varying the current 15, In a frequency-meter, the combination with a pair of independently-movable coils, a field-coil in series with each of said movable coils, apairof indicating devices cooperating to indicate the frequency, one ofsaid indil eating devices being controlled by each movable coil, and a condenser in series with one of said movable coils.

4 16. In afrequency-meter, the combination with a pair of-independently-movable coils arranged in multiple circuit, of a field-coil in series -with'each of said movable coils, a pair 17. In a freguency-meter, the combination with apair o independently-movable coils arranged in multiple circuit, a field-coil in series with each of said movable coils, a pair of indicating devices cooperating toindicate,

the frequency, one of said indicating devices being controlled by each movable coil, and a condenserin series with one of said movable coils. g a

In testimony whereof I have hereunto set my hand and aflixed my seal in the presence of-.thetwo subscribing witnesses.

ALEXANDER s. LANGSDORF. [n s.]

Witnesses:

EDGAR W, JAooBs, W. A. ALEXANDER. 

